[Rd] Problems with package containing S4 classes

[cstrato]

Dear all,

Currently, I am trying to create a test package "testS4" using S4 classes,
which I am attaching.

Running R CMD check gives the following error:

coeurebooks-computer:/Volumes/CoreData/CRAN cs$ R CMD check 
testS4_0.1.1.tar.gz
* checking for working latex ...sh: line 1: latex: command not found
 NO
* using log directory '/Volumes/CoreData/CRAN/testS4.Rcheck'
* using R version 2.5.0 Under development (unstable) (2007-02-26 r40806)
* checking for file 'testS4/DESCRIPTION' ... OK
* this is package 'testS4' version '0.1.1'
* checking package dependencies ... OK
* checking if this is a source package ... OK
* checking whether package 'testS4' can be installed ... OK
* checking package directory ... OK
* checking for portable file names ... OK
* checking for sufficient/correct file permissions ... OK
* checking DESCRIPTION meta-information ... OK
* checking top-level files ... OK
* checking index information ... OK
* checking package subdirectories ... OK
* checking R files for non-ASCII characters ... OK
* checking R files for syntax errors ... OK
* checking whether the package can be loaded ... ERROR
Error in library.dynam(lib, package, package.lib) :
        shared library 'testS4' not found
Error: package/namespace load failed for 'testS4'
Execution halted

Can someone explain what this error means?
What is meant with "shared library"?

For another test package I get the following error
coeurebooks-computer:/Volumes/CoreData/CRAN cs$ R CMD INSTALL -l 
~/Library/R/library mytest_0.3.2.tar.gz
* Installing *source* package 'mytest' ...
** R
** save image
Error in setMethod("export", "derivedClass", export.derivedClass) :
        no existing definition for function "export"
Error: unable to load R code in package 'mytest'
Execution halted

This error is even more strange since I cannot reproduce it in the 
attached package.
What may be the reason for this error?

Thank you in advance.
Best regards
Christian
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C.h.i.s.t.i.a.n S.t.r.a.t.o.w.a
V.i.e.n.n.a       A.u.s.t.r.i.a
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